Answer:
Unos años antes, en 1948, la severa contaminación industrial del aire creó una niebla tóxica mortal que asfixió a 20 personas en Donora, Pensilvania, y enfermó a 7.000 más. La lluvia ácida, descubierta por primera vez en la década de 1850, fue otro problema derivado de las plantas de carbón.
Translation: A few years earlier, in 1948, severe industrial air pollution created a deadly smog that asphyxiated 20 people in Donora, Pennsylvania, and made 7,000 more sick. Acid rain, first discovered in the 1850s, was another problem resulting from coal-powered plants.
Explanation:
The other name for the European Recovery Program, and the one that is more commonly used is the Marshall Plan. This plan had as its objective to boost after-war economy in Europe.
It was offered to many European Countries, but some refused because they were under the influence of the Soviet Union.
The marginal cost is how much it costs to produce one item more. It cost 0$ to produce 0 bikes but if you make one, then it costs 80$. Hence the marginal cost for the first bike is 80$. For the fourth bike, we have that the 3 bikes cost 110$ and the 4 bikes cost 130$. Hence it costs 20$ dollars to produce one more bike (from 3rd to 4th) and hence the marginal cost is 20$. Similarly for the 6th bike, we compare the cost of producing 5 bikes to the cost of producing 6 bikes and we get that the marginal cost is 50$. Applying the same methodology, the marginal cost for the 7th bike is 60$.
